Adaptation, multiple disease resistance and acid soils tolerance of bean genotypes.

Abstract

The objective of this

experiment was to select bean genotypes with high yield

potential, wide adaptation, multiple disease resistance and

tolerance to acid soils. For that reason, during the Fall-Winter

1999-2000 cycle, a uniform yield trial was conducted in four

environments in Veracruz and Chiapas, Mexico. Sixteen

genotypes were evaluated, including the varieties Negro

Jamapa as a regional control. A randomized Complete Block

design with three replications was used. Grain yield was

evaluated by means of individual and combined analysis of

variance and stability parameters. Reaction to diseases was

graded according to a 1-9 scale; the Efficiency Index (IE) was

used to evaluate the tolerance to acid soils. There were

significant differences in grain yield and tolerance to diseases

for localities, genotypes and the locality .genotype

interaction; whereas for the tolerance to acid soils there was

no significant differences between localities and the

interaction. The best genotypes with regard to yield,

adaptation and tolerance to acid soils were Negro 8025,

DOR-454, Icta Ju 95-112, Icta Ju 93-15 and DOR-448; the

first and the last varieties had multiple resistance to diseases.

The lines UCR-55, TLP-22 and DOR-500 also showed high

yields and multiple disease resistance.